The x-ray screens

The x-ray screens are devices that convert invisible x-ray image in the image optical, available visual observation or photography. The action of x-ray screens based on the ability of x-rays to cause glow (luminescence) some substances, bearing the name of svetoslavov (phosphors). As svetoslavov apply tungstate calcium (CaWO4) and zinc cadmium-sulfide, activated silver [(Zn, Cd)S-Ag], x-ray screens are film coated evenly with powdered svetoslava pasted on paper or plastic substrate.
In the x-ray to x-ray screens used activated silver zinc cadmium-sulfide Svetoslav giving yellow-green luminescence is required brightness, to which the eye is most sensitive.
X-ray screens, to x-ray sensitive to the joint action of natural light and moisture, and therefore after work, they should be covered with a black case and store in a dry room. X-ray to x-ray screens included x-ray machines and coated glass with the equivalent of 2 mm
X-ray screens for fluorography, unlike x-ray to x-ray screens, intensive activity that can significantly reduce the brightness, so change them very often.
The screens are used for x-rays, are named intensifying screens. Phosphor in them is calcium tungstate, strongly absorbing x-rays and having a blue-violet illumination, which is sensitive x-ray film. Reinforcing x-ray screens allow a 10 - 20 times to reduce exposure and, consequently, reduce radiation exposure. Usually use a pair of x-ray screens and bilateral x-ray film. Reinforcing x-ray screens increase the image contrast. To get a good x-rays , you need a tight fit x-ray screen the film. The surface x-ray intensifying screens should be smooth, clean, cracks and stains leave traces on film. In order to protect intensifying screens from mechanical damage and contamination it is recommended to store it in the closed cassettes.